100GHz transistors

The interesting thing about that abstract isn't the 100GHz - all sorts of handmade graphene transistors seem to be able to do that well - but the phrase "Transistors were fabricated on epitaxial graphene synthesized on the silicon face of a silicon carbide wafer" which suggests that these particular transistors might be susceptible to mass-production, which is what we have all been waiting for.

-- Bill Sloman, Nijmegen

On a sunny day (Fri, 5 Feb 2010 15:00:53 -0800 (PST)) it happened Bill Sloman wrote in :

Even more interesting is the maximum speed it can do I am not talking about 100GHz.

One day after the first 100GHz CPU hits stores, all the software dorks of the planet will invent such abstract, surreal and wasteful new ways to "program" that you won't be able to tell that CPU from a 1GHz PIII. Picture a 1TB mouse driver that needs a few dozen virtual machines ... Because you can.

But we as users are often not much better than bloatware programmers. I often receive drawings as printable docs. Typically a huge file, even one-sheeters often wouldn't have fit onto a floppy disk back in the old days. Yet one can create the same sort of info in a 50k PNG file ...

In 1989 my whole biz book-keeping database set fit onto one 1.44MB disk, including the SW to run it. My 2009 set would still fit on such a disk, except that the "modern" SW version needs several times more program storage space than my whole hard drive had back then.

On Feb 5, 5:21=A0pm, Joerg wrote: > But we as users are often not much better than bloatware programmers. I > often receive drawings as printable docs. Typically a huge file, even > one-sheeters often wouldn't have fit onto a floppy disk back in the old > days. Yet one can create the same sort of info in a 50k PNG file ... >

Does it at least work better?

G=B2

No it works the same. It's very simple, MS-Works database. I bought the first version when it came out, 1.05, and it had literally no bugs. The later versions have way too much fluff for my taste and after 6.0 bugs crept it. So I wouldn't recommend anything higher. Nothing earth-shattering, but if copy-paste via keyboard shortcut misses every so often that does get old. Especially when doing the year-end job.

oman

Then what on earth are you talking about? And why isn't the 100GHz figure - which you chose to emphasise by using it to name of this thread - a useful indicator of the speed of the part?

-- Bill Sloman, Nijmegen

Yawn..100GHz transistors existed in the late 1970s..

What would be more interesting is how the various crystalline faces of C affect the characteristics...

What exactly does cut off frequency mean for a FET ?

In bipolars the current gain drops below 1 at fT but you still can get some usable power gain in common base configuration at higher frequencies.

Before the invention of real microwave tubes (such as klystrons, magnetrons TWTs etc.) much of the UHF/microwave amplification was done my grounded grid tubes.

On a sunny day (Sat, 06 Feb 2010 09:27:51 +0200) it happened Paul Keinanen wrote in :

Yes, but apart from power gain, say linear applications, an area where this would have applications is in switching circuits. Think 100 GHz up to 5 THz (if my info is right) processors. That would change a few thing.

Because scaling it downwards and otherwise tweaking it will likely push it to 1THz, which is what the project is aiming at.

Looks like a smooth transition to graphene will occur within the decade. Moore's Law marches on.

There is a company I deal with (I informally administer the computers for them). Someone there designed a new format for quotations. Basically a single-page Excel file with some thumbnails of the products. Thanks to the wonders of MS Office (and ignorance) the document ended up ~200MB. For each quote. They were generating a few GB per day for something that could have been typed up on a few pages of A4. I only found out when "the internet got slow"... Then there's another guy there who likes to regularly dump 5GB of solidworks modelling data onto the server.

Same here, for a couple of years after we started all my PCB design files & source code went on one floppy.

Common gate is even done with FETs. A professor at our university once proclaimed that would be stupid. Until I showed him the schematic of my amp and then that of a commercial transceiver ...

Still is. The nice advantage of that is that you don't have to burn off the drive power in the form of heat.

JFETS I presume?

Sometimes. But the one I dealt with on my very first job was a MOSFET.

Why so? Hadn't he heard of grounded grid triodes?

Definitely not because his eye popped open when I showed him a schematic of a grounded grid RF power amp. I tended to build mine grounded cathode but only because I didn't have enough drive power or back then as a student not enough dough to buy the required new tubes. Or to be honest, I didn't want to raid the beer kitty to buy those.